Long-term high-temperature resistant biotemplated composite coating for AZ91D magnesium alloy protection  

作　　者：Shupei Liu Xinfang Zhang Chijia Wang Changqing Yin Jinsong Rao Yuxin Zhang Dusan Losic 

机构地区：[1]State Key Laboratory of Mechanical Transmissions,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,PR China [2]Chemistry and Chemical Engineering College,Northeast Petroleum University,Daqing 163000,PR China [3]School of Chemical Engineering,The University of Adelaide,Adelaide,SA 5005,Australia

出　　处：《Journal of Magnesium and Alloys》2025年第3期1050-1065,共16页镁合金学报(英文)

基　　金：support provided by the National Natural Science Foundation of China(Grant No.51908092);Projects(No.2020CDJXZ001,2021CDJJMRH-005 and SKLMT-ZZKT-2021M04)supported by the Fundamental Research Funds for the Central Universities;the Joint Funds of the National Natural Science Foundation of China-Guangdong(Grant No.U1801254);the project funded by Chongqing Special Postdoctoral Science Foundation(XmT2018043);the Chongqing Research Program of Basic Research and Frontier Technology(cstc2017jcyjBX0080);Natural Science Foundation Project of Chongqing for Post-doctor(cstc2019jcyjbsh0079,cstc2019jcyjbshX0085);Technological projects of Chongqing Municipal Education Commission(KJZDK201800801);the Innovative Research Team of Chongqing(CXTDG201602014);the Innovative technology of New materials and metallurgy(2019CDXYCL0031)。

摘　　要：Integrating different active substances through carriers and fully exerting their synergistic corrosion inhibition ability is an efficient anticor-rosion strategy.Biotemplate(diatomite)was used to integrate polyaniline and sodium phosphate,an active antisepticfiller(PANI/DM/SP)was prepared in this work.Moreover,activefillers were combined with epoxy resins to prepare high-efficiency anti-corrosion coatings for mag-nesium alloy protection.The stability of the corrosion inhibitor(sodium phosphate)released by the activefiller was analyzed by establishing a mathematical model.Simultaneously,electrochemical impedance spectroscopy tests demonstrate excellent corrosion inhibition properties of activefillers and the impedance modulus of composite coatings was three orders of magnitude higher than that of the EP coating,due to the synergistic effect of each component of the activefiller.In addition,the mechanical properties of the composite coating were significantly improved,with tests showing a 51.31%increase in rub resistance and two grades of adhesion improvement(ASTM standard).The key of this work was to give full play to the slow-release characteristics of diatomite through scientific methods and promote the synergistic anticorrosion effect of sodium phosphate and polyaniline.

关 键 词：Magnesium alloy protection Active corrosion inhibition Biotemplated composite coating High-temperature resistance 

分 类 号：TG174.4[金属学及工艺—金属表面处理]